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The Pentium contains a complicated circuit to multiply by three

Ken Shirriff Blog · published 2 March 2025

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https://www.heise.de/hintergrund/Zahlen-bitte-Verrueckt-Fuer-X3-brauchte-der-Pentium-einen-eigenen-Schaltkreis-10323633.html
heise.de
https://en.wikipedia.org/wiki/Kogge%E2%80%93Stone_adder
en.wikipedia.org
https://commons.wikimedia.org/wiki/File:Kogge-stone-8-bit.png
commons.wikimedia.org
https://bitsavers.trailing-edge.com/components/intel/80386/231746-001_Introduction_to_the_80386_Apr86.pdf
bitsavers.trailing-edge.com
https://bsky.app/profile/righto.com
bsky.app
https://www.agner.org/optimize/instruction_tables.pdf
agner.org
https://bpb-us-w2.wpmucdn.com/sites.coecis.cornell.edu/dist/4/81/files/2019/06/4740_lecture21-adder-circuits.pdf
bpb-us-w2.wpmucdn.com
https://personal.utdallas.edu/~ivor/ce6305/m4.pdf
personal.utdallas.edu
https://en.wikipedia.org/wiki/Brent%E2%80%93Kung_adder
en.wikipedia.org
https://commons.wikimedia.org/wiki/File:Brent-kung-8-bit.png
commons.wikimedia.org
https://en.wikipedia.org/wiki/Logical_effort
en.wikipedia.org
https://www.ece.ucdavis.edu/~bbaas/281/papers/Booth.1951.pdf
ece.ucdavis.edu
https://doi.org/10.1109/PGEC.1964.263830
doi.org
https://ieeemilestones.ethw.org/w/images/8/82/Some_schemes_for_parallel_multipliers_%28reprint%29.pdf
ieeemilestones.ethw.org
https://doi.org/10.1109/MWSCAS.1992.271307
doi.org
https://doi.org/10.1109/ARITH.1997.614873
doi.org
http://i.stanford.edu/pub/cstr/reports/csl/tr/94/617/CSL-TR-94-617.pdf
i.stanford.edu
https://pdfs.semanticscholar.org/9da8/de2627aa0d4669995c430210c6ea9844ddf1.pdf
pdfs.semanticscholar.org
https://pages.hmc.edu/harris/cmosvlsi/4e/cmosvlsidesign_4e_ch11.pdf
pages.hmc.edu
Elsewhere on righto.com (14)
https://static.righto.com/images/pentium-mult3/pentium-labeled.jpg
static.righto.com
https://static.righto.com/images/pentium-mult3/wide-view.jpg
static.righto.com
https://static.righto.com/images/pentium-mult3/kogge-stone.jpg
static.righto.com
Reverse-engineering a carry-lookahead adder in the Pentium Read at the source ↗
righto.com
https://static.righto.com/images/pentium-mult3/block-poly-labeled.jpg
static.righto.com
https://static.righto.com/images/pentium-mult3/overall-diagram.jpg
static.righto.com
Two interesting XOR circuits inside the Intel 386 processor Read at the source ↗
righto.com
https://www.righto.com/2013/09/understanding-z-80-processor-one-gate.html
righto.com
https://static.righto.com/images/pentium-mult3/xnor-diagram.jpg
static.righto.com
https://static.righto.com/images/pentium-mult3/bicmos-driver.jpg
static.righto.com
https://static.righto.com/images/pentium-mult3/driver-diagram.jpg
static.righto.com
Interesting BiCMOS circuits in the Pentium, reverse-engineered Read at the source ↗
righto.com
The Pentium as a Navajo weaving Read at the source ↗
righto.com
https://static.righto.com/images/pentium-mult3/brent-kung.png
static.righto.com